physics

A pitcher throws a 0.5kg ball of clay at a 6kg block of wood. The clay sticks to the wood on impact and their joint velocity afterwards is 3m/s. What is the original speed of the clay? I know the answer is 39m/s but I have no idea how they come up with that

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  1. momentum is conserved

    the mass of the clay, times its velocity; is equal to the mass of the clay+block, times its velocity

    0.5 * v = (6 + 0.5) * 3

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  2. 39m/s

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